Heat treatment method for high ferrochrome roll requiring stepped hardness of roll body

Abstract

The invention discloses a heat treatment method for a high ferrochrome roll requiring stepped hardness of a roll body. The method mainly comprises the following steps of: before the roll is preheated, coating ceramic fibers on parts, which have low hardness requirement on the roll body, close to the roll necks of the roll; performing preheating treatment, differential temperature heat treatment and quenching treatment; before tempering, removing the ceramic fibers on two end parts of the roll; and performing tempering treatment on the roll in a low temperature tempering furnace. By the heat treatment method, the technical requirement that the roll body of the roll has stepped hardness can be met.

Description

technical field [0001] The invention relates to the field of steel rolling manufacturing, in particular to a heat treatment method under the condition that the hardness of the roll body needs to have a gradient when manufacturing high-chromium ferrous rolls. Background technique [0002] Rolls are the main spare parts consumed in steel rolling production. The rolls mainly include the roll body and the roll neck connected with both ends of the roll body. The quality of the rolls directly affects the production rate of the rolling mill, as well as the output, quality and production cost of rolled materials. Due to the high hardness of M7C3 carbides in high-chromium iron, and the carbides are distributed in the matrix in a blocky shape, the continuity of the matrix is ​​enhanced, so high-chromium iron has good toughness and wear resistance, and it is used in the manufacture of rolls. Effect. The production process of the roll must go through a heat treatment process to control...

AI Technical Summary

Problems solved by technology

This method is mainly a heat treatment method to solve the cracking of the end of the roll, and it cannot solve the problem of the stepped hardness requirement of the roll body